Abstract
This paper proposes a method to measure the direction of an indicator and to extract the center of a circular analog meter in an objective image. It is difficult to exchange analog meters for digital meters because many meters must be checked by the human visual sense in industrial fields. Then, a method to recognize an analog meter in a captured image is required. In the proposed method, the center of a circular meter is extracted by the combinational Hough transform based on the geometrical feature between a pair of edge pixels on the meter frame and an edge pixel on the indicator. The experimental results show that the centers of analog meters were extracted and the inclinations of indicators were measured successfully by the proposed method.
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